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In mammals, what process does NOT occur during the citric acid cycle?
选项：

A:formation of α-ketoglutarate;
B:generation of NADH and FADH2;
C:metabolism of acetyl-CoA to carbon dioxide;
D:net synthesis of oxaloacetate from acetyl-CoA

发布时间：2024-06-24 09:25:33

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1. In mammals, what process does NOT occur during the citric acid cycle? 选项： A、formation of α-ketoglutarate B、generation of NADH and FADH2 C、metabolism of acetyl-CoA to carbon dioxide D、net synthesis of oxaloacetate from acetyl-CoA
2.In myocytes, what is a possible fate of acetyl-CoA produced from the oxidation of a fatty acid?选项： A:oxidation via the citric acid cycle; B:use in ketogenesis; C:use in gluconeogenesis; D:both oxidation via the citric acid cycle and use in ketogenesis
3.In myocytes, what is a possible fate of acetyl-CoA produced from the oxidation of a fatty acid? 选项：both oxidation via the citric acid cycle and use in ketogenesisB、use in gluconeogenesis C、oxidation via the citric acid cycle D、use in ketogenesis
4.In hepatocytes, what is a possible fate of acetyl-CoA produced from the oxidation of a fatty acid? 选项：A、use in gluconeogenesis B、use in ketogenesis both oxidation via the citric acid cycle and use in ketogenesisboth oxidation via the citric acid cycle and use in gluconeogenesis
5.In hepatocytes, what is a possible fate of acetyl-CoA produced from the oxidation of a fatty acid? 选项： A、use in ketogenesis B、use in gluconeogenesis C、both oxidation via the citric acid cycle and use in ketogenesis D、both oxidation via the citric acid cycle and use in gluconeogenesis
6.In hepatocytes, what is a possible fate of acetyl-CoA produced from the oxidation of a fatty acid?选项： A:use in ketogenesis; B:use in gluconeogenesis; C:both oxidation via the citric acid cycle and use in ketogenesis; D:both oxidation via the citric acid cycle and use in gluconeogenesis
7.The oxaloacetate and α-ketoglutarate produced during the citric acid cycle are transferred from the mitochondrial matrix back to the cytosol, where they serve as precursors for the production of many essential molecules, such as the amino acids _____________ and glutamate, respectively.
8.Although the citric acid cycle directly generates only one ATP per turn (in the conversion of succinyl-CoA to succinate), the four oxidation steps in the cycle provide a large flow of electrons into the respiratory chain via NADH and FADH2 and thus lead to formation of a large number of ATP molecules during ______________________.
9.Which of the following statements about the TCA cycle is wrong? () 选项： A、Oxygen is used to oxidize the acetyl group carbons of acetyl-CoA in the TCA cycle. B、Three molecules of NADH and one molecule of FADH2 are produced in one turn of the TCA cycle. C、Oxygen is not used in the TCA cycle, so the cycle can occur in anaerobic conditions. D、The TCA cycle produces the water that is formed during the complete oxidation of glucose.
10.In nonphotosynthetic eukaryotes, nearly all the acetyl-CoA used in fatty acid synthesis is formed in ____________ from pyruvate oxidation and from catabolism of the carbon skeletons of amino acids. 选项： A、nucleus B、cytosol C、mitochondria D、endoplasmic reticulum
11.________ is a product of glycolysis, pyruvate processing, and the citric acid cycle.（2.5）选项： A: ATP B: CO2 C: NADH D: FADH2
12.One of the major roles of the TCA cycle is to generate reduced cofactors for ATP production from oxidative phosphorylation. The compound donating the net eight electrons to the cofactors is which one of the following? 选项： A:Pyruvate B:Acetyl-CoA C:Lactate D:Oxaloacetate E:Phosphoenolpyruvate
13.【单选题】One of the major roles of the TCA cycle is to generate reduced cofactors for ATP production from oxidative phosphorylation. The compound donating the net eight electrons to the cofactors is which one of the following? 选项： A:Pyruvate B:Acetyl-CoA C:Lactate D:Oxaloacetate E:Phosphoenolpyruvate
14.If the two Cs of the acetyl-CoA were radioactively labelled when entering TCA, the release of radioactive carbon dioxide can be detected after the first round of cycle.选项： A:正确; B:错误
15.(单选题) One of the major roles of the TCA cycle is to generate reduced cofactors for ATP production from oxidative phosphorylation. The compound donating the net eight electrons to the cofactors is which one of the following? 选项： A:Pyruvate B:Acetyl-CoA C:Lactate D:Oxaloacetate E:Phosphoenolpyruvate
16.Which of the following statement is true of the citric acid cycle 选项： A、It requires coenzyme biotin, FAD, NAD+ and coenzyme A B、Two NADH are produced per turn C、It participates in the synthesis of glucose from pyruvate D、Enzymes are located in cytosol
17.The main function of the citric acid cycle is the harvesting of high-energy electrons from carbon fuels. （）
18.Which statement best describe the function of the universal electron carriers NAD[sup]+/NADH and FAD/FADH2 in human cells? (4.0)[/] 选项： A、They donate electrons to the electron transport chain. B、They accept protons from intermediates of the citric acid cycle. C、They donate electrons to intermediates of the citric acid cycle. D、They accept electrons from the electron transport chain.
19.The citric acid cycle is the hub of glucose, fat and amino acid metabolism.选项： A:正确; B:错误
20.Plants take in carbon dioxide and release oxygen using light as energy during the process of __________.选项： A:respiration; B:transpiration; C:photosynthesis; D:metabolism
21.The reducing equivalents for synthesis of fatty acids and cholesterol mainly come from选项： A:glycolysis pathway; B:citric acid cycle; C:pentose phosphate pathway; D:fatty acid oxidation; E:reaction catalyzed by malic acid
22.【单选题】The citric acid cycle is a series of oxidation reactions that removes carbon atoms from substrates in the form of CO2. Once a molecule of acetyl CoA enters the citric acid cycle, how many complete cycles are required for both of the carbon atoms in its acetyl groupto be oxidized to CO2? 选项： A:1 B:2 C:3 D:4
23.Which of the following statements about the synthesis of fatty acids is correct?选项： A: NADPH is used for fatty acid synthesis.; B: NADPH is formed from fatty acid synthesis.; C:NADH is formed from fatty acid synthesis.; D:NADH is used for fatty acid synthesis.
24.The key enzymes in citric acid cycle include选项： A:isocitrate dehydrogenase; B:malate dehydrogenase; C:α-ketoglutarate dehydrogenase complex; D:citrate synthase

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In mammals, what process does NOT occur during the citric acid cycle?选项： A:formation of α-ketoglutarate; B:generation of NADH and FADH2; C:metabolism of acetyl-CoA to carbon dioxide; D:net synthesis of oxaloacetate from acetyl-CoA

In mammals, what process does NOT occur during the citric acid cycle?
选项：

A:formation of α-ketoglutarate;
B:generation of NADH and FADH2;
C:metabolism of acetyl-CoA to carbon dioxide;
D:net synthesis of oxaloacetate from acetyl-CoA